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Thread: Converting 6.5 Grendel back to 7.62x39

  1. #1
    Boolit Mold
    Join Date
    May 2014

    Converting 6.5 Grendel back to 7.62x39

    Hello Guys,
    I am an older member, but I believe this is my first post. I have a friend who has a bunch of 6.5 Grendel brass that was made from 7.62x39 brass. I don't own a 6.5 Grendel, but I do own a few 7.62x39 rifles and I am always looking for boxer primed, reloadable, affordable brass. My friend is offering me some of this brass, and, if I can make this conversion from 6.5 Grendel back to 7.62x39, I would like to try. My friend Larry is willing to do some trading, but I am not convinced this conversion is even possible. Has anyone here tried this before, and if so, how did it go?
    Thanks in advance,

  2. #2
    Boolit Master
    Rcmaveric's Avatar
    Join Date
    Jul 2017
    Jacksonville, FL
    Anything is possible. I would assume it could work. Down side is the fire forming things thins the brass walls. When you size it and put that taper back in it, that brass is gonna flow some where. Try it and see. Lube it so it doesn't stick in the sizer dies. Check the case length afterwards. I would anneal them after sizing to relieve any stress on the brass and soften the heavy work hardening.

    I fire form Grendel brass. I almost got my hands on an SKS. The deal fell through though.
    "Speak softly and carry a big stick; you will go far."
    ~Theodore Roosevelt~

  3. #3
    Boolit Master

    nicholst55's Avatar
    Join Date
    Jan 2007
    Daegu, Korea
    If the price/deal was right, I think I might try to either sell the Grendel brass and buy 7.62X39 brass, or else see if I could trade it for something else useful.
    Boycott YouTube

  4. #4
    Super Moderator

    Preacher Jim's Avatar
    Join Date
    Apr 2014
    It takes a good tapered expander to open the neck then anneal the brass. That said you could trade 6.5 G. For 7.62x39 easily so why reform the brass.
    I open 223 to .243 and .308 so it would be possible for you. Imperial sizing was now Hornady product is your friend to do this.

  5. #5
    Boolit Master
    TheGrimReaper's Avatar
    Join Date
    Jan 2011
    Quote Originally Posted by nicholst55 View Post
    If the price/deal was right, I think I might try to either sell the Grendel brass and buy 7.62X39 brass, or else see if I could trade it for something else useful.
    This is what I'd do too.

  6. #6
    Join Date
    Jun 2018
    Brass is cheap, why mess around with incorrect head stamp ?

  7. #7
    Boolit Master

    HABCAN's Avatar
    Join Date
    Jul 2005
    East Central Alberta, Kanada
    Trade for it......and then trade it away for what you want/need. Why mess with it?
    Life Member NRA.
    Member: RWVA.
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    Founder: Guns of the Golden West (Show group).
    Founder: Nosehills Gun Club.
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    Retired from Instructing, and just about everything else!

  8. #8
    Boolit Master
    Join Date
    Jun 2018
    I have some boxer primed brass 7.62x39 cases I'd be interested in trading. Please send me a PM.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check